245/50R18 vs 255/55R18
255/55R18 is 5.1% taller (+1.40 in) and 0.39 in wider than 245/50R18.
255/55R18 is 5.1% taller than 245/50R18. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
Real speed on 255/55R18.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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245/50R18 or 255/55R18?
Can I use 255/55R18 instead of 245/50R18?
255/55R18 is 5.1% taller than 245/50R18. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears. Also match or beat the original load index and speed rating, and check that the wheel width suits the new tire.
Will my speedometer be off?
At an indicated 60 mph on 255/55R18 you are really doing 63.0 mph if the speedometer was set up for 245/50R18. Going the other way, 245/50R18 would make it read 57.1 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.70 in (+18 mm) under the axle.